"He served in a host of communications roles during the campaign, the transition and then the White House, becoming communications director for much of Obama's first term and then being promoted to senior adviser for the first two years of the second term," CNN wrote in its announcement.

"He left his post as the White House's senior adviser for strategy and communications in March as one of Obama's longest-tenured strategists," the network wrote.

According to The Hill, Pfeiffer has been a key player in moving the Obama administration to take an active role in new media, including the appearances Obama has made on YouTube, BuzzFeed and Vice.